Üsküdar in the context of "Chalcedon"

Theodosius III (Greek: Θεοδόσιος, romanized: Theodósios) was Byzantine emperor from c. May 715 to 25 March 717. Before rising to power and seizing the throne of the Byzantine Empire, he was a tax collector in Adramyttium. In 715, the Byzantine navy and the troops of the Opsician Theme, one of the Byzantine provinces, revolted against Emperor Anastasius II (r. 713–715), acclaiming the reluctant Theodosius as emperor. Theodosius led his troops to Chrysopolis and then Constantinople, the capital, seizing the city in November 715. Anastasius did not surrender until several months later, accepting exile in a monastery in return for safety. Many themes viewed Theodosius to be a puppet of the troops of the Opsician Theme, and his legitimacy was denied by the Anatolics and the Armeniacs under their respective strategoi (generals) Leo the Isaurian and Artabasdos.

Leo declared himself emperor in the summer of 716 and allied himself with the Umayyad Caliphate, the Islamic empire; Theodosius sought aid from the Bulgarians under Khan Tervel (r. 700–721), setting a firm border at Thrace and ceding the Zagoria region to the Bulgarians, as well as stipulating the payment of tribute to them. Leo then marched his troops to Constantinople, seizing the city of Nicomedia, and capturing many officials, including Theodosius' son, also named Theodosius. With his son in captivity, Theodosius took the advice of Patriarch Germanus and the Byzantine Senate, and negotiated with Leo, agreeing to abdicate and recognize Leo as emperor. Leo entered Constantinople and definitively seized power on 25 March 717, allowing Theodosius and his son to retire to a monastery. Exactly when Theodosius died is uncertain, but it may have been on 24 July 754.

Nicomedia (/ˌnɪkəˈmiːdiə/; Greek: Νικομήδεια, Nikomedeia; modern İzmit) was an ancient Greek city located in what is now Turkey. In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by the emperor Diocletian who ruled in the east), a status which the city maintained during the Tetrarchy system (293–324).

The Tetrarchy ended with the Battle of Chrysopolis (Üsküdar) in 324, when the western Roman emperor Constantine the Great defeated Licinius and became the sole emperor. In 330, Constantine chose for himself the nearby Byzantium (which was renamed Constantinople, modern Istanbul) as the new capital of the Roman Empire.

The Battle of Chrysopolis was fought on 18 September 324 between the Roman emperors Constantine I and Licinius near Chrysopolis (modern Üsküdar), opposite Byzantium (modern Istanbul) on the Asiatic shore of the Bosphorus. The battle followed Constantine's victory at the Battle of the Hellespont, where his son Crispus destroyed the Licinian fleet. Licinius withdrew his forces from Byzantium to Chalcedon and gathered the remnants of his army, reinforced by Visigothic auxiliaries and the troops of the co-emperor Martinian.

Constantine crossed the Bosphorus into Asia Minor and marched on Chrysopolis. Licinius drew up his army with the traditional pagan standards, while Constantine advanced under the labarum. Constantine launched a direct attack that routed Licinius' troops. Ancient sources report heavy losses for Licinius, and he retreated with the survivors to Nicomedia.

Kadıköy (Turkish pronunciation: [kaˈdɯkøj] ) is a municipality and district in Istanbul Province, Turkey. Its area is 25 km, and its population is 467,919 (2023). It is a large and populous area in the Asian side of Istanbul, on the northern shore of the Sea of Marmara. It partially faces the historic city centre of Fatih on the European side of the Bosporus. It is bordered by the districts of Üsküdar, to the northwest, Ataşehir, to the northeast, and Maltepe, to the southeast.

Kadıköy was known in classical antiquity and during the Roman and Byzantine eras as Chalcedon (Greek: Χαλκηδών). Chalcedon was known as the 'city of the blind'. The settlement has been under control of many empires, finally being taken by the Ottomans before the fall of Constantinople. At first, Chalcedon was rural, but with time it urbanized. Kadıköy separated from the Üsküdar district in 1928.

Kuzguncuk is a neighbourhood in the municipality and district of Üsküdar, Istanbul Province, Turkey. Its population is 4,151 (2022). It is on the Asian side of the Bosphorus. The neighborhood is centered on a valley opening to the Bosphorus and is somewhat isolated from the main part of the city, being surrounded by nature preserves, cemeteries, and a military installation. It is a quiet neighborhood with streets lined with antique Ottoman wooden houses.

Kuzguncuk is bordered on the north by Beylerbeyi, on the east by Burhaniye, on the south by İcadiye and Sultantepe, and on the west by the Bosphorus. On the other side of the Bosphorus is Beşiktaş. The Otoyol 1 highway separates the neighborhood from Burhaniye.

Küçük Çamlıca TV & Radio Tower (Turkish: Küçük Çamlıca TV-Radyo Kulesi), or simply Çamlıca Tower, (Turkish pronunciation: [tʃamlɯdʒa]) is a telecommunications tower with observation decks and restaurants on Little Çamlıca Hill in Üsküdar district of Istanbul, Turkey.

The total height of the tower is 369 metres (1,211 ft), 221 metres (725 ft) of which is a 49-storey reinforced concrete structure with 18 metres (59 ft) below ground. The height of the tower's steel antenna is 168 metres (551 ft). With a total height of 587 metres (1,926 ft) above sea level, it carries the title of the highest structure in Istanbul.

Chrysopolis (Greek: Χρυσόπολις or Χρυσοῦπολις, meaning "golden city"), can refer to:

• Üsküdar, an Asian suburb of Istanbul, Turkey
• Chrysopolis (sidewheeler) a side-wheel steamboat that ran between Sacramento and San Francisco in the later 19th century
• Chrysopolis, California, a ghost town in Inyo County, California
• Chrysopolis (Thrace), the medieval name of the ancient city of Eion at the mouths of the Strymon river

The Maiden's Tower (Turkish: Kız Kulesi), also known as Leander's Tower (Tower of Leandros) since the Byzantine period, is a tower on a small islet at the southern entrance of the Bosphorus strait, 200 m (220 yd) from the coast of Üsküdar in Istanbul, Turkey.

The tower appeared on the reverse of the Turkish 10 lira banknote from 1966 to 1981.